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(11)

EP 1 675 697 A1

(12)

(43) Date of publication: 05.07.2006 Bulletin 2006/27 (21) Application number: 04792994.8 (22) Date of filing: 20.10.2004

(51) International Patent Classification (IPC):  B21J 5/08(1968.09) B21K 1/14(1968.09) B21J 9/06(1968.09) B21K 1/18(1968.09) (86) International application number: PCT/JP2004/015878 (87) International publication number: WO 2005/037459 (28.04.2005 Gazette 2005/17)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR (30) Priority: 21.10.2003 JP 2003360934 27.10.2003 US 513990 P (71) Applicant: Showa Denko K.K. Tokyo 105-8518 (JP)	(72) Inventors: OTAKI, A., Oyama Reg. Office, Showa Denko K.K. Oyama-shi, Tochigi 323-8678 (JP) HAMANO, H., Oyama Reg. Office, Showa Denko K.K. Oyama-shi, Tochigi 323-8678 (JP) (74) Representative: Viering, Jentschura & Partner  Patent- und Rechtsanwälte, Steinsdorfstrasse 6 80538 München 80538 München (DE)